EP2789146A2 - Détection de point d'accès pirate - Google Patents

Détection de point d'accès pirate

Info

Publication number
EP2789146A2
EP2789146A2 EP12853997.0A EP12853997A EP2789146A2 EP 2789146 A2 EP2789146 A2 EP 2789146A2 EP 12853997 A EP12853997 A EP 12853997A EP 2789146 A2 EP2789146 A2 EP 2789146A2
Authority
EP
European Patent Office
Prior art keywords
access point
wireless access
network
hotspot
rogue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP12853997.0A
Other languages
German (de)
English (en)
Inventor
Francis James Scahill
Richard Joseph Evenden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Priority to EP12853997.0A priority Critical patent/EP2789146A2/fr
Publication of EP2789146A2 publication Critical patent/EP2789146A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H04L63/1425—Traffic logging, e.g. anomaly detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0876—Network architectures or network communication protocols for network security for authentication of entities based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H04L63/1416—Event detection, e.g. attack signature detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1433—Vulnerability analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/12—Detection or prevention of fraud
    • H04W12/121—Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS]
    • H04W12/122—Counter-measures against attacks; Protection against rogue devices

Definitions

  • the present invention relates to computer networks and in particular to a method and apparatus for determining rogue entities on a wireless network infrastructure.
  • IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN) communication between devices using an over the air protocol.
  • WLAN wireless local area network
  • the 802.11 standard specifies that a wireless access point generating a WLAN is a Basic Service Set (BSS) and it must be named using a Service Set Identifier (SSID).
  • BSS Basic Service Set
  • SSID Service Set Identifier
  • the 802.11 standards Due to the range limitations of WiFi transmission, the 802.11 standards also allow for multiple wireless access points to be configured to present the same SSID and thereby provide access to the same network. To enable this additional functionality, the 802.11 standards specify an "extended service set" (ESS) which allows for a set of one or more interconnected BSSs and integrated local area networks that appear as a single BSS to the logical link control layer at any station associated with one of those BSSs.
  • ESS extended service set
  • An extended service set is specified using an extended Service Set Identification (ESSID). This may be desirable in situations such as in a building which is larger than the range of a single wireless access point.
  • any device can join a hotspot in a public Wi-Fi network
  • the devices do not gain access to external networks such as the internet until they have passed security checks implemented by an Authentication, Authorisation & Accounting (AAA) server located within the core of the public access network.
  • AAA Authentication, Authorisation & Accounting
  • the hotspots are configured to redirected users to a login page hosted by a proxy gateway in the core of the public Wi-Fi network.
  • the user can then enter credentials which are forwarded to an AAA server for authentication. If the authentication is successful, then the user can access the Internet.
  • Standards such as 802. lx have been proposed to provide 2-way authentication such that the client device can be sure it is in communication with a genuine hotspot but this is not yet widely implemented because it relies on a supplicant being installed in advance on the client device.
  • wireless access points It is known for wireless access points to periodically turn off their WLAN and enter a listening mode in order to determine if there are any other access points (including rogue or private LANs access points) in the surrounding area.
  • the disadvantage of such active scanning is that there is a loss of service when the access point functionality is turned off.
  • the range of the scan is limited to the propagation range of the wireless signal that can be received. It is therefore desirable to have a more transparent method of detecting rogue access points and alerting users when such devices are detected.
  • the present invention provides a method of rogue access point detection as set out in claim 1.
  • the present invention provides an access point in a wireless access network according to claim 4. In a further aspect, the present invention provides an access network according to claim 7.
  • Figure 1 shows an example public Wi-Fi network in accordance with a first embodiment of the present invention
  • Figure 2 shows the functional components of a genuine hotspot forming a part of the public Wi-Fi network illustrated in Figure 1;
  • Figure 3 is a flow chart showing the operational steps performed by a genuine hotspot to detect rogue access points in the first embodiment
  • Figure 4 shows an example public Wi-Fi network in accordance with a second embodiment of the present invention
  • Figure 5 shows the functional components of a genuine hotspot forming a part of the public Wi-Fi network illustrated in Figure 4.
  • Figure 6 is a flow chart showing the operational steps performed by a genuine hotspot to detect rogue access points in the second embodiment.
  • FIG. 1 shows part of a BT Openzone public Wi-Fi network 1 in accordance with a first embodiment.
  • the BT Openzone network 1 has two public Wi-Fi access points 3 (hereinafter referred to as genuine hotspots 3), a Public Access Control (PAC) gateway 5, a Dynamic Host Configuration Protocol (DHCP) server 6 and a Remote Authentication Dial In User Service (RADIUS) server 7.
  • Figure 1 also shows two wireless client devices 11 such as a laptop computer and a PDA which require access to the Internet 9.
  • the BT Openzone network 1 actually consists of a premium Openzone network of hotspots located in retail and public places, and also includes a public network formed of customer home wireless access points known as FON. This embodiment relates to the BT Openzone network of premium hotspots and therefore the genuine hotspots are premium BT hotspots.
  • Each genuine hotspot 3 generates a WLAN carrying the "BT Openzone" ESSID and while the genuine hotspots 3 are located at a different geographical location but they are close enough to have overlapping ranges.
  • the genuine hotspots 3 are typically located in public places such as shops, telephone boxes or railway stations.
  • Each genuine hotspot 3 is a wireless router device capable of operating under the IEEE 802.11 ⁇ , 802. llg & 802.11b standards within the BT Openzone hotspot network 1) and configured so that it provides a bridge between external networks as well as components in the network 1 and wireless client devices 11.
  • the connection to other components in the network BT Openzone public network 1 is via a wired connection such as Gigabit Ethernet or a Digital Subscriber Line (DSL).
  • DSL Digital Subscriber Line
  • the BT Openzone public Wi-Fi network 1 also includes a Public Access Control (PAC) Gateway 5.
  • PAC Public Access Control
  • This component is responsible for providing access and control services within the BT Openzone network 1 such as IP address allocation. It also manages the web page redirection functionality to direct client devices to the BT Openzone login web page so that users can log into the BT Openzone network 1 in order to access external networks such as the Internet 9.
  • the PAC gateway 5 sends the user's log in information to the RADIUS server 7 and if the credentials are correct, then the PAC gateway will allow the wireless client device to access the external networks.
  • wireless client devices 5 can therefore connect to any genuine hotspot 3 forming part of the BT Openzone public Wi-Fi network 1 and gain access to the same services using a single set of credentials.
  • the conventional process for a wireless client device 11 joining the BT Openzone network 1 will now be described.
  • the laptop 11a When the user of the laptop 11a enables the Wi-Fi connection the laptop 11a will perform a scan for surrounding hotspots. Assuming the BT Openzone SSID is already stored in a profile, the laptop 11a will see both genuine hotspots 3a and 3b. In order to choose which hotspot 3 to connect to, the laptop 11a simply chooses the hotspot providing the strongest wireless signal strength. In this example, the connection to genuine hotspot 3a is better so the laptop 11a chooses that hotspot for authentication and association.
  • the next stage is association so that the security and bit rate options between the laptop 11a and the hotspot 3a are established.
  • the laptop 11a learns the MAC address of the hotspot 3a and the hotspot 3a maps an association identifier logical port to the laptop 11a.
  • the next stage involves the laptop issuing a DHCP request to the hotspot's DHCP Server 6 located within the network core. From the DHCP request the laptop will be supplied with: an IP address, a subnet mask, a gateway IP address (5) and a DNS IP address.
  • the laptop 11a issues an Address Resolution Protocol (ARP) request in order to obtain the Iayer2 MAC address for the PAC gateway IP address.
  • ARP Address Resolution Protocol
  • the ARP response contains the MAC address of the PAC gateway 5 for the hotspot.
  • the laptop then updates its routing table so that packets are forwarded to the hotspot 3a via the PAC gateway 5.
  • the laptop 11a is associated with the hotspot 3a and has presence on the BT Openzone network.
  • the laptop 11a cannot yet access the Internet 9 because of the second stage of authentication.
  • the hotspot 3a forwards the request to the PAC gateway 5 which redirects the client to a BT Openzone login page instead of the requested page so that the user can authenticate with login credentials such as username and password.
  • this login page is secured using an encrypted Secure Sockets Layer (SSL) session between the laptop's 11a browser session and the PAC Gateway.
  • SSL Secure Sockets Layer
  • the entered credentials are forwarded to the RADIUS server 7 and if they are correct and the user has sufficient credit, then the PAC gateway 5 allows access to the Internet. It also causes the browser to open a new window with a link to give the user the option to disconnect from the BTOpenzone network 1 to avoid excessive costs.
  • the laptop 11a Since the laptop 11a is a mobile device, it is configured to periodically poll the surrounding area and make a note of the surrounding SSIDs and the relative signal strengths. In this way, if the user of the laptop 11a moves location, then the wireless device can associate with a different hotspot providing stronger signal strength.
  • the data link layer will disassociate with hotspot 3a and authenticate and associate with hotspot 3b.
  • the higher network layers will not realise that they are. communicating with a different physical device because the (layer 3) IP stack of the client device has not been informed.
  • the laptop 11a already has an IP address and the default gateway information (including the gateway MAC address) is the same so therefore the laptop 11a will continue to send data packets to a valid IP address.
  • the new hotspot 3b recognises the gateway MAC address as being its own and therefore delivers the packets as normal.
  • FIG. 1 shows a further access point 13 which is not a genuine BT Openzone hotspot 3 but has been configured by a malicious entity to masquerade as one. To achieve this it also has an ESSID of "BT Openzone" and therefore any wireless client device 11 such as a pda 11c which determines a greater signal strength from the rogue wireless access point 13 than other genuine hotspots 3 could connect to the rogue wireless access point 13 believing it is part of the BT Openzone network.
  • This rogue wireless access point 13 may even present a fake version of the login page in order to steal the user's login credentials.
  • the rogue wireless access point 13 is also connected to the Internet and therefore once the client device 11c has authenticated and associated with the rogue wireless access point 13, the rogue wireless access point 13 provides access to the Internet. Since the rogue wireless access point 13 can sniff data packets travelling between the wireless client device 11c and a correspondent node located on the internet the rogue wireless access point 13 would may be able to capture any unencrypted data. This problem is particularly relevant to smartphone devices which are set up to automatically connect to the BT Openzone hotspot network 1 in an unattended manner by way of an app, or via commercial agreements between the cellular network operator and BT Openzone.
  • FIG. 2 shows the functional components of a genuine hotspot 3 according to the present embodiment.
  • the genuine hotspot 3 contains wireless network interface 21, wireless association and authentication 23, a wired network interface 25, a rogue access point detector 27 and a routing controller 29.
  • the wireless association and authentication unit 23, rogue access point detector 27 and rduting controller 29 are software functions running on a processor (not shown) executing appropriate program instructions.
  • the wireless network interface 21 is a standard component capable of operating under the IEEE 802.11 ⁇ , 801.11b & 802. llg standards and it broadcasts its SSIO of BT Openzone to the surrounding area and when a client device 11 wishes to connect to the genuine hotspot 3, the wireless association and authentication unit 23 deals with the usual association and authentication issues so as to enable communication with the wireless client device 11 and the network core via the wired network interface 25.
  • the routing controller 29 updates its internal routing tables (not shown) to record the wireless device's network addresses and to ensure that the packets to and from that device are correctly routed.
  • the wired network interface 25 is a very-high-bit-rate Digital Subscriber Line (VDSL) interface to the PAC gateway 5.
  • VDSL Very-high-bit-rate Digital Subscriber Line
  • the rogue access point detector 27 is a new component that is responsible for determining whether a wireless client 11 has roamed from an authentic hotspot or more importantly whether that wireless client 11 had been connected to a rogue wireless access point.
  • the rogue access point detector 27 examines these packets to infer information about the previously connected hotspot. If it determines that the previous hotspot was a rogue wireless access point 13, then it can inform the user of the client device 11 that their information may have been compromised so that they can take appropriate action.
  • the two genuine hotspots 3 have the following configuration:
  • the rogue access point 13 ⁇ has the following configuration:
  • the wireless client devices 11 have the following configuration:
  • Client devices 11a and lib are connected to the genuine hotspots 3a and 3b respectively.
  • Client device 11c is connected to rogue access point 13 but the user of this device has moved location and is about to connect to genuine hotspot 3a.
  • step si the rogue access point detector 27 examines the packet and in particular the information in the destination MAC address field.
  • the rogue access point detector 27 checks if the destination MAC address in the packet matches that of the genuine hotspot gateway 5. If the MAC address in the packet matches, i.e. is 00:00:DB:00:25:4l, then the packet is assumed to have come from an existing authenticated device 11 such as laptop 11a or an authorised client device that has roamed to the current genuine hotspot from another genuine hotspot. Processing moves to step s5 in which the packet is routed to the next destination and then processing by the rogue access point detector 27 for the packet ends ⁇
  • the genuine hotspot 3 determines that the previous access point was a rogue access point 13.
  • the rogue access point detector 27 is arranged to notify the user of the wireless client device 11 that their personal information may have been compromised. This may be achieved in a number of ways, for example by sending the client to a pre-prepared message stored in the genuine otspot 3, or a page redirection to a warning page.
  • the BT Openzone network 1 contains profile information for each user. The profile can be examined for alternative contact information such as a telephone number or email so that the user can be alerted. ,
  • the genuine hotspots 3 are able to determine the presence of a rogue access point based on the received packets from client devices. This has a number of advantages over conventional methods of rogue access point detection.
  • the genuine hotspots do not need to actively monitor for rogue access points. This improves the throughput of the hotspots because there is no need to switch from transmission to a listen only mode so as to pick up possible rogues.
  • hotspots can deduce that a rogue access point may be nearby even if it is outside of the hotspot's wireless range since the client device has recently roamed to the current hotspot.
  • the first embodiment therefore provides an effective way to detect rogue access points in a passive manner based on the information contained within received data packets.
  • the rogue access points are detected by a genuine hotspot having a rogue access point detector which checks whether the MAC address matches the default gateway MAC address.
  • Such processing is particularly relevant for BT Openzone's premium hotspot devices.
  • the 8T Openzone public Wi-Fi network also includes a home user network known as FON.
  • Figure 4 shows an example network 101 having public Wi-Fi wireless access points 103, a PAC gateway 105, a DHCP server 106 and a RADIUS server 107 for allowing client devices 111 to connect to the Internet 109.
  • the operation of the core network components PAC gateway 105, DHCP server 106 and RADIUS server 107 are the same as their corresponding components in the first embodiment and so their functionality will not be described again.
  • the genuine hotspots 103 are FON hotspots instead of premium Openzone hotspots, and due to configuration differences, their processing is slightly different from the premium genuine hotspots in the first embodiment.
  • the general functional components of these genuine hotspots 105 are the same as the genuine hotspots 3 in the first embodiment.
  • the data link layer will disassociate with hotspot 103a and authenticate and associate with hotspot 103b.
  • the higher network layers will not realise that they are communicating with a different physical device because the (layer 3) IP stack of the client device has not been informed.
  • the laptop 111a already has an IP address and the default gateway information (including the gateway MAC address) is the same so therefore the laptop 111a will continue to send data packets to a valid IP address.
  • the new hotspot 103b Upon receiving these data packets, the new hotspot 103b does not recognise the gateway MAC address as being its own and therefore simply ignores the packets without returning any messages or delivery reports to the laptop 111a. After a predetermined period of inactivity, the packets time out and so the laptop 111a reissues a request for address resolution in order to obtain the correct MAC address for the new hotspot 103b. Once this new association has been established, the hotspot will again forward data requests to the PAC gateway 105 which redirect the user to the log in page. Once the user has again logged in and their credentials have been verified, then the browsing session can continue.
  • FIG. 5 shows the functional components of the genuine hotspots 103.
  • the genuine hotspot 103 contains a wireless interface 121, a wireless association and authentication module, a wired network interface, a rogue access point detector 127 and a routing controller 129.
  • the functional components are similar to their counterpart modules in the first embodiment namely wireless interface 21, wireless association and authentication 23, wired network interface 25 and routing controller 29.
  • the genuine hotspots functionality of the rogue access point detector 127 is slightly different to that of the rogue access point detector 27 in first embodiment and will be described with reference to Figure 6.
  • the initial configuration of the rogue access point 113 and the client devices 111 is the same as the rogue access point 13 and the client devices 11 respectively in the first embodiment.
  • the configuration of the FON genuine access points 103 is set out below:
  • step slOl the rogue access point detector 127 examines the packet and in particular the information in the destination MAC address field.
  • step sl03 the rogue access point detector 127 checks if the destination MAC address in the packet matches that of the genuine hotspot gateway 103. If the MAC address in the packet matches, i.e. is 00.O0:DB:00:25:41, then the packet is assumed to have come from an existing authenticated device 111 such as laptop 111a. Processing moves to step sl05 in which the packet is routed to the next destination and then processing by the rogue access point detector 127 for the packet ends.
  • the packet is assumed to be from a new client device 111 that has roamed into the range of the genuine hotspot 103.
  • the rogue access point detector 127 checks the authenticity of the MAC address, i.e. whether the MAC address is that of a genuine hotspot 103 within the FON network 101. To carry out this test, it is not necessary for the rogue access point detector 127 to have knowledge of every genuine hotspot 103 in the entire public Wi-Fi network 101. Looking at the configuration data, it can be seen that BT Openzone genuine hotspots 103 all have a unique MAC address prefix of 00:O0:DB which is unique to BT routers in the MAC addressing scheme. Therefore the rogue access point detector 127 does not need to do extensive processing to determine whether the access point is authentic and allowed on the network. It only needs to match the first 3 octets in the MAC address with the authorised octets of 00:00:DB.
  • step S109 a test is performed to check whether the analysed packet relates to an authentic hotspot 103. If the test is passed and the first 3 octets match, then the rogue access point detector 127 concludes that the packet was received from a client device 111b which was previously attached to a genuine hotspot 3 such as PDA 111b. In this case processing proceeds to step sill where the genuine hotspot 103a drops the data packet so that the client device will eventually request a new association with the new genuine hotspot 103a and the routing controller 129 can update its routing information.
  • the rogue access point detector 127 infers that the previous access point was a rogue access point 13. In step s33, the rogue access point detector 27 is arranged to notify the user of the wireless client device 111c that their personal information may have been compromised.
  • the BT Openzone network 101 contains profile information for each user. The profile can be examined for alternative contact information such as a telephone number or email so that the user can be alerted.
  • step sill the received packet is dropped by the genuine hotspot and processing ends.
  • the genuine hotspots 103 contain rogue access point detectors 127 in order to detect rogue access points 113 within a public Wi-Fi network such as the BT FON network 101.
  • the genuine hotspots are able to detect the rogue access points and to alert the users of client devices which have roamed over from a rogue access point located in the vicinity of the genuine hotspot.
  • the genuine hotspot is able to carry out this detection without having to actively scan for rogue access points.
  • the passive detection prevents loss of service in the genuine hotspot and also allows for the detection of rogue access points which are beyond its scanning range.
  • the rogue access point 13, 113 is configured to have the same ESSID as the genuine hotspots 3, 103.
  • the genuine hotspots 3, 103 are able to detect rogue access points 13, 113 and alert any client which roamed over from the rogue access point 13, 113.
  • the owner of the rogue access point 13, 113 may also change the MAC address of the rogue access point gateway to appear as if it is a genuine hotspot in order to further hide the rogue access point 13, 113 from detection.
  • This is because it is fairly easy to change the reported MAC address using a technique known as MAC address spoofing.
  • the rogue hotspot could spoof its address to have the MAC prefix 00:00:DB associated with BT Openzone routers and thereby pass the address checking test carried out by the next authentic hotspot that the client device connects to.
  • the processing of the rogue access point detector includes a further step between steps si and s3 of the first embodiment and steps slOl and sl03 of the second embodiment.
  • the rogue access point detector checks for a spoofed MAC address but consulting the DHCP server 6, 106 in the core of the network 1, 101.
  • the DHCP server 6, 106 contains a list of the IP addresses and MAC address pairings which have been allocated within the network 1,101.
  • step s3 or sl03 the processing of the, first and second embodiment proceeds to step s3 or sl03 respectively.
  • processing proceeds to step s7 and sll3 respectively of the first and second embodiment in order to alert the user that they have been using a rogue access point.
  • rogue access points are detected even when the rogue access point uses MAC address spoofing.
  • genuine hotspots can detect the presence of rogue hotspots using MAC address spoofing in a case where the rogue hotspot spoofed the genuine hotspot's MAC address. This was possible because the genuine hotspots are configured to remember which MAC and IP address pairs they had issued. Furthermore, where the MAC addressed had been spoofed to make the rogue access point appear to be a different genuine hotspot, the function of the DHCP server in remembering all the allocated IP and MAC address pairs allowed the genuine hotspots to determine externally allocated addresses.
  • a second test for MAC address spoofing is described. This test relies on a location table in the network core which maintains a record of the position of genuine hotspots.
  • the rogue access point detector When the rogue access point detector checks for a spoof MAC address, it sends its own MAC address and the MAC address in the packet to the location server. The location server determines their relative locations and if the distance between them is above a threshold, then the location returns an alert. In response to this alert, the rogue access point detector alerts the user of the client device.
  • the PAC gateway is modified so as to notify genuine hotspots which are near genuine hotspot which detected the rogue access point of the detected rogue.
  • relevant wireless clients who are already connected to the hotspot network and in the vicinity of the genuine hotspot which detected the rogue hotspot are warned that there is a rogue hotspot in the area. This can be carried out as a multicast message, or by accessing the user profile to obtain a telephone number or email.
  • the genuine hotspots are configured to perform the MAC address checks.
  • the genuine hotspots forward the checks to the PAC gateway which carries out the authentication checks.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un réseau de points d'accès sans fil public qui comprend des points d'accès autorisés partageant le même SSID et connectés à un cœur de réseau qui met en œuvre une authentification centralisée de manière à ce que des dispositifs clients sans fil puissent se déplacer entre des points d'accès autorisés. Chaque point d'accès autorisé est conçu pour détecter la présence de points d'accès pirates non autorisés se faisant passer pour des points d'accès autorisés. Les points d'accès autorisés inspectent des paquets de données reçus en provenance de dispositifs clients sans fil qui sont arrivés à portée et peuvent déterminer, à partir des informations d'adressage figurant dans la couche MAC et la couche IP, si le dispositif sans fil a été précédemment connecté à un point d'accès pirate. Si une telle détermination est effectuée, l'utilisateur du dispositif est alerté du fait que ses informations confidentielles peuvent avoir été compromises.
EP12853997.0A 2011-11-30 2012-11-30 Détection de point d'accès pirate Ceased EP2789146A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12853997.0A EP2789146A2 (fr) 2011-11-30 2012-11-30 Détection de point d'accès pirate

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11250916.1A EP2600648A1 (fr) 2011-11-30 2011-11-30 Détection d'un point d'accès sans fil non autorisé
PCT/GB2012/000879 WO2013079905A2 (fr) 2011-11-30 2012-11-30 Détection de point d'accès pirate
EP12853997.0A EP2789146A2 (fr) 2011-11-30 2012-11-30 Détection de point d'accès pirate

Publications (1)

Publication Number Publication Date
EP2789146A2 true EP2789146A2 (fr) 2014-10-15

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EP11250916.1A Ceased EP2600648A1 (fr) 2011-11-30 2011-11-30 Détection d'un point d'accès sans fil non autorisé
EP12853997.0A Ceased EP2789146A2 (fr) 2011-11-30 2012-11-30 Détection de point d'accès pirate

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Application Number Title Priority Date Filing Date
EP11250916.1A Ceased EP2600648A1 (fr) 2011-11-30 2011-11-30 Détection d'un point d'accès sans fil non autorisé

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US (1) US9603021B2 (fr)
EP (2) EP2600648A1 (fr)
WO (1) WO2013079905A2 (fr)

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WO2013079905A3 (fr) 2014-10-23
US20140325615A1 (en) 2014-10-30

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